Low-Fiber Diet
Low dietary fiber is one of the most consistently identified, and most modifiable, risk factors for hemorrhoids — it works primarily by making stool harder and bowel movements more effortful, which increases straining.
- Fiber adds bulk and retains water in stool, making it softer and easier to pass with less straining.
- Most adults in Western countries consume well below recommended fiber intake.
- Increasing fiber gradually, alongside adequate fluids, is generally more effective and better tolerated than a sudden large increase.
Why fiber matters mechanically
Fiber isn’t digested the way other nutrients are — much of it passes through largely intact, adding bulk to stool and, for soluble fiber in particular, helping stool retain water. Both effects make stool softer and easier to pass, directly reducing the straining that contributes to hemorrhoid formation (see Constipation and straining).
How much fiber is generally recommended
General guidance for adults is roughly 25–35 grams of fiber per day, though recommendations vary somewhat by source and by individual factors (age, sex, overall diet). Most adults in Western countries consume meaningfully less than this on average, which is part of why increasing fiber is one of the most frequently recommended, and most evidence-supported, changes for both preventing and managing hemorrhoid symptoms.
Good sources of fiber
- Whole grains (oats, whole wheat, brown rice)
- Legumes (beans, lentils, chickpeas)
- Fruits, especially with skin intact (apples, pears, berries)
- Vegetables, particularly cruciferous and leafy varieties
- Nuts and seeds
Why gradual increases matter
Increasing fiber suddenly and substantially can cause bloating, gas, and discomfort, especially without a corresponding increase in fluid intake. A gradual increase over one to two weeks, paired with adequate water intake, is generally better tolerated and more sustainable than an abrupt change.
When diet alone isn’t enough
If dietary changes aren’t sufficient, a fiber supplement (such as psyllium) is a reasonable next step, generally introduced the same way — gradually, with adequate fluids. Ongoing constipation despite these measures is worth discussing with a doctor rather than continuing to increase fiber intake indefinitely without improvement.
This page is for general education and reflects general dietary guidance — individual fiber needs can vary, and significant digestive symptoms are worth discussing with a doctor.